EFFECTS OF ACCELERATION ON THE ACCURACY OF MR PHASE-VELOCITY MEASUREMENTS

被引：47

作者：

OSHINSKI, JN ^{[1
]}

KU, DN ^{[1
]}

BOHNING, DE ^{[1
]}

PETTIGREW, RI ^{[1
]}

机构：

[1] GEORGIA INST TECHNOL,GEORGE W WOODRUFF SCH MECH ENGN,277 FERST DR,ATLANTA,GA 30332

来源：

JMRI-JOURNAL OF MAGNETIC RESONANCE IMAGING | 1992年 / 2卷 / 06期

关键词：

BLOOD; FLOW DYNAMICS; LOOD VESSELS; STENOSIS OR OBSTRUCTION; GRADIENT WAVE-FORMS; PHANTOMS; VASCULAR STUDIES;

D O I：

10.1002/jmri.1880020610

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

Acceleration in blood flow can affect the accuracy of phase velocity measurements. Convective acceleration is due to changes in flow geometry and is independent of the time-varying acceleration caused by flow pulsatility. To analyze the effects of convective acceleration on flow velocity measurements, phase velocity measurements were obtained in steady laminar flow in the convergent segment of a 90%, hourglass-shaped stenosis phantom at a Reynolds number of 1,500. Measurements at the stenosis indicated that convective acceleration caused the measured values of average cross-sectional velocity to deviate as much as 37% from the theoretical values. The magnitude of the error could be accounted for by including the convective acceleration term in the phase shift equation. Convective acceleration effects should not be ignored in flow velocity measurements through stenoses. even when time-dependent acceleration due to flow pulsatility can be neglected.

引用

页码：665 / 670

页数：6

共 21 条

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